Regional avarage trend detection of Turkish evaporation data

Trend analysis of hydrological variables due to global climate change has gained more importance today. The existence of trends in hydrological time series done with non-parametric Mann-Kendall Rank Correlation Test. In this study, in Turkey, statistical analysis is sufficient to allow the extent of at least 43 observations of evaporation stations to a maximum of 66 for April-October months of the total monthly evaporation data for statistical trends detected with the spatial Mann-Kendall Rank Correlation Test and for the 7 geographic regions of Turkey as a regional (1975-2006) developed a new Regional Average Mann-Kendall Rank Correlation Test statistics and trends are identified.As a result, Evaporation data indicates that on the spatial basis May, June, July, August and October months are generally seen as a trend to increase, furthermore in April and September decrease were determined. On Regional scale, the 7 geographic regions of Turkey, while an increase in the maximum upward trend, the Mediterranean, Southeast Anatolia and Central Anatolia region was found.Key Words: Evaporation, Trend Analysis, Turkey, Mann-Kendall Rank Correlation Test, Regional Average Mann-Kendall Rank Correlation Test.